CMS features will not be part of the Muse 1.0 release. We intend to add CMS features to Muse in the future that will work with Adobe's Business Catalyst platform. Business Catalyst already has CMS features (see http://www.businesscatalyst.com/product-tour/overview for more info), but Muse isn't yet able to take advantage of them natively.

I hired a VERY good programmer, and he could literally do NOTHING with the html and css that Muse exported. He was trying to build a CMS for me (before Adobe came out with their version of a CMS) and we just got nowhere with it. He tried to convert it to something Joomla could even understand. No dice.

That was a very time-consuming mistake for my project. Don't make the same mistake as me.